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    <p>If you've moved all the <code>Model</code> stuff into <code>GLWidget</code> then I assume you are now creating your <code>GLWidget</code> instance in <code>::loadModel</code>? If so then be aware that this is being created in a new thread. It looks like it doesn't automatically get moved into the main (GUI) thread when the loading thread finishes. What actually happens to the QObject is <a href="https://stackoverflow.com/questions/5383296/what-happens-to-the-thread-affinity-of-a-qobject-created-within-a-worker-thread/8957696#8957696">an open question</a>.</p> <p>If you want to disable threading completely in order to simplify things then remove the lines</p> <pre><code>#ifndef QT_NO_CONCURRENT #include &lt;QFutureWatcher&gt; #endif </code></pre> <p>and</p> <pre><code>#ifndef QT_NO_CONCURRENT QFutureWatcher&lt;Model *&gt; m_modelLoader; #endif </code></pre> <p>in openglscene.h. In the OpenGLScene constructor body remove the lines</p> <pre><code>#ifndef QT_NO_CONCURRENT connect(&amp;m_modelLoader, SIGNAL(finished()), this, SLOT(modelLoaded())); #endif </code></pre> <p>In <code>OpenGLScene::loadModel(const QString &amp;filePath)</code> change</p> <pre><code>#ifndef QT_NO_CONCURRENT m_modelLoader.setFuture(QtConcurrent::run(::loadModel, filePath)); #else setModel(::loadModel(filePath)); modelLoaded(); #endif </code></pre> <p>to just</p> <pre><code> setModel(::loadModel(filePath)); modelLoaded(); </code></pre> <p>Finally remove</p> <pre><code>#ifndef QT_NO_CONCURRENT setModel(m_modelLoader.result()); #endif </code></pre> <p>from <code>OpenGLScene::modelLoaded()</code>.</p>
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    1. POLoading files into drawBackground(QPainter *painter, const QRectF &)
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    1. COWell, as I understand it, it is not possible to load obj-files as I tried to do. I have tried to push my object into the main-thread but it isnt working. I am a complete newbie to threading. I have researched a little bit on this matter, but I cant get a grip on this. The whole concept of threading seems to be a BIG thing. Might there be another way to load obj.-files? Maybe without threading. From your answer I get the feeling that there might be a possibility. Could you be more specific? Thank you.
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    2. CO@buddy: You can certainly remove the threading easily enough as there are two code paths wherever the threading is used. Which one is compiled in is dependent on the QT_NO_CONCURRENT preprocessor macro. Either ensure that this macro is defined at the top of the relevant source files or just comment out the threading code (which is in the `ifndef QT_NO_CONCURRENT` bits). Try this and see if it works. If you want to get it working with threading let me know and I can see what I can do.
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    3. COActually Qt seem to have another problem.I have removed the threading from the unchanged sourcecode.(Where i still have the model class).This is working fine. As soon as I add to the Model class `: public QGLWidget` I get the error: It is not safe to use pixmaps outside the GUI thread. So it seems to be rather the inheritance in general than the threading. And the inheritance I need in GLWidget Do you know why that might be?
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